Local Knowledge - City of London
Serving buildings near St Paul's Cathedral, the Guildhall, and the Bank of England.
The Square Mile: mostly offices, with a small resident population
The City of London covers 1.12 square miles and is governed by the City of London Corporation. Over 500,000 people worked there in 2019, yet the 2021 census counted just 8,583 residents. Most leak detection in the City is therefore for offices, shops, restaurants and other commercial premises, usually arranged through a facilities team or managing agent.
Many of the City's residents live on two estates designed by Chamberlin, Powell and Bon. The Golden Lane Estate was built between 1954 and 1962, and the Barbican between 1965 and 1976, with around 2,000 flats, maisonettes and houses. Both are listed, and both call for a different approach from an ordinary London street.
Commercial buildings and managing agents
In an office building, water can escape from a riser, a kitchenette, washrooms, heating or cooling pipework or a tenant's own fit out, and it often shows on the floor below before anyone finds it on the floor where it began. Commercial leak detection starts from £300, and the survey can be planned around trading or working hours when you book.
Facilities managers often need a written answer as much as a repair. A trace and access survey, from £350 to £450, records where the leak was found, how it was found and which part of the building it affects, which helps landlords, tenants and insurers agree who pays. With water escaping now, emergency detection runs from £300 in working hours and £450 out of hours.
Restaurants and cafes carry their own risks, with pipes to dishwashers, glass washers, coffee machines and floor drains packed into small kitchens. In older offices, heating and hot water systems may have been altered during several refits, so drawings are not always reliable. Thermal imaging, from £150, and tracer gas, from £200, show where the pipes actually run.
Barbican flats: electric floor heating and water ingress
Barbican flats are warmed by electric cables laid in the floors, a communal background system that the City Corporation runs from 1 October to 30 April. Because no hot water circulates through it, a Barbican leak is rarely a heating leak in the usual sense. Water that appears is more likely to come from supply or waste pipes, appliances or a neighbour's bathroom.
The Barbican Estate Office asks residents to report water penetration to its Repairs Service Desk, which usually raises an investigation the same day. If the source is a leaseholder's own fitting, such as a shower, washing machine or dishwasher, that investigation can be recharged. When you want an independent answer, our survey traces the source and records it, and the engineer plans any thermal imaging around the floor heating, since warm floors change surface temperatures.
Golden Lane Estate: boilers now, electric heating planned
Golden Lane was built with communal heating, but in the 1980s its flats moved to individual gas boilers or electric heating. The City's major works programme plans to remove the gas supply and fit new electric heating and hot water systems, in phases between 2028 and 2035.
Until then, flats with a gas boiler can lose pressure through leaks at radiators, valves or pipes set in floors. Record the boiler pressure over a few days and look at the pressure relief pipe. Thermal imaging, from £150, follows warm pipes, and acoustic detection, from £150, listens for pressurised leaks. Problems with estate pipework should be reported to the City Corporation as landlord. Major works on Great Arthur House, the estate's 16 storey tower, are expected to take place between 2029 and 2031.
Supply and access in the Square Mile
Thames Water supplies the City and is responsible for its network up to the outside stop valve. Inside the boundary, the supply pipe and everything beyond it belongs to the building owner, which in the City is often a landlord acting through a managing agent. In a building shared by several tenants, the lease terms usually decide who pays for a leak on the shared supply, and the managing agent is the natural first contact.
Before the survey, agree access to plant rooms, risers and neighbouring units with building management, and have drawings or maintenance manuals ready if they exist. To arrange a survey anywhere in the City, call 020 3912 0200.
Guides for City of London Homes
Leak Detection in City of London: Common Questions
Do you carry out leak detection in City of London offices and shops?
Yes, we survey commercial premises across the Square Mile, including offices, shops, restaurants and mixed use buildings, as well as homes on the Barbican and Golden Lane estates. Commercial leak detection starts from £300. The written report records the leak position and how it was found, which helps facilities teams, landlords and insurers decide on the repair.
Could the leak in my Barbican flat be coming from the underfloor heating?
Barbican floor heating uses electric cables rather than water pipes, so it cannot leak water itself. Water in a Barbican flat is more likely to come from supply or waste pipes, an appliance or a neighbour's bathroom. Report water penetration to the Barbican Estate Office first. If you want the source traced independently, our survey checks for water loss and records where it was found.
Can a survey be arranged around office hours?
Timing can be discussed when you book, so the survey can be planned to limit disruption to staff and customers. For a leak that is causing damage now, emergency detection is available, priced from £300 in working hours and £450 out of hours. Let us know about building access rules and any permits needed for plant rooms.
Who is responsible for a leak in a Golden Lane Estate flat?
The City of London Corporation is the landlord, so report leaks on estate pipework and in shared parts to it. Leaseholders may be responsible for pipes and fittings serving only their own flat, depending on the lease. If the source is unclear, our survey checks the flat for water loss, traces the leak and records which pipe was at fault.
Leak Detection Services in City of London
From hidden pipe leaks to underfloor heating failures, our EC1–4-based specialists handle every type of water leak across City of London. We use non-invasive technology to locate the source without damaging your property.
Water Leak Detection
Hidden water leaks in City of London found using thermal imaging and acoustic equipment. We locate the source without ripping up floors or walls, and provide insurance-ready reports for EC1–4 homeowners.
Learn more →Thermal Imaging Survey
Professional thermal imaging surveys in City of London to detect hidden leaks, damp, and insulation defects. Our FLIR cameras reveal temperature anomalies invisible to the naked eye across EC1–4 properties.
Learn more →Acoustic Leak Detection
Advanced acoustic listening equipment to trace pressurised pipe leaks in City of London. We pinpoint the exact location of the leak through walls, floors, and underground pipes across the EC1–4 area.
Learn more →Trace & Access
Full trace and access service in City of London for insurance claims. We locate the leak, document the findings, and provide a detailed report that insurers require for EC1–4 properties.
Learn more →Central Heating Leak Detection
Losing boiler pressure in City of London? Our engineers use thermal imaging and pressure testing to find hidden central heating leaks in EC1–4 homes without disrupting your system.
Learn more →Underfloor Heating Leak Detection
Specialist underfloor heating leak detection in City of London using thermal cameras and pressure testing. We trace faults in wet underfloor systems across EC1–4 without lifting your floor.
Learn more →Water Mains Leak Detection
External water mains leak detection in City of London using acoustic correlation and tracer gas. We locate underground supply pipe failures across EC1–4 accurately and non-invasively.
Learn more →Swimming Pool Leak Detection
Professional swimming pool and spa leak detection in City of London. We use pressure testing, dye testing, and acoustic methods to locate leaks in pool shells, pipework, and fittings across EC1–4.
Learn more →Emergency Leak Detection
24/7 emergency leak detection in City of London. When you have an active leak causing damage, our engineers respond fast with full detection equipment to find and stop the problem across EC1–4.
Learn more →Damp & Moisture Detection
Professional damp and moisture surveys in City of London to determine whether dampness is caused by a leak, condensation, or rising damp. Detailed reports for EC1–4 property owners and insurers.
Learn more →The City of London Leak Detection Team You Can Trust
We are specialist leak detection engineers, not general plumbers. Our team knows Central London inside out and brings professional-grade thermal cameras, acoustic sensors, and tracer gas equipment to every job in City of London.
- Specialist leak detection engineers, 24/7 phone line
- Non-invasive thermal imaging and acoustic technology
- Detailed trace and access reports for insurers
- Every survey backed by our written guarantee
- Round-the-clock service including bank holidays
Neighbourhoods We Serve in City of London
Our engineers cover every part of City of London and the surrounding Central London area. These are the areas we attend most often, and what tends to be different about each one.
Leak detection in Barbican
EC2YConcrete estate with communal risers serving many flats, where access has to be arranged with the estate before anything is isolated.
Leak detection in Moorgate
EC2Offices above and beside residential, so surveys here are usually out of hours and usually commercial systems.
Leak detection in Aldgate
EC3Older buildings converted to flats and offices, with original pipework serving later layouts.
Leak detection in Farringdon
EC1Converted warehouses with exposed services, where the leak is often traceable but the ownership of it is not.
Leak detection in Bank
EC2R, EC3VCommercial buildings where a leak on one floor reaches several tenancies, and the report deciding liability matters as much as the repair.
Engineers covering all of City of London
Call 020 3912 0200, day or night
Suspect a Leak in City of London? Call Us Now.
Whether it is a damp patch that appeared overnight or a water bill that has doubled for no obvious reason, we can find the source. Available 24/7 including weekends and bank holidays.
Looking for Leak Detection Near You in City of London?
If you're searching for leak detection near me in City of London, you've found the right team. Our specialists are based across the EC1–4 postcode area and respond to callouts in City of London and the surrounding Central London neighbourhoods day or night, including weekends and bank holidays.
We handle everything from emergency leak detection near City of London to scheduled thermal imaging surveys, trace and access reports, and central heating leak investigations. Every survey uses non-invasive technology, and all reports are insurance-ready. Our local presence in the EC1–4 area means we know the housing stock, the common leak issues, and the fastest routes to your door.
In City of London, we regularly attend properties around Barbican, Moorgate, and Aldgate. Whether you need emergency leak detection near me at 2am or want to book a thermal imaging survey in City of London for later in the week, call 020 3912 0200 and we'll get it sorted.